Geekspeak for EndOfRant, like EOL (EndOfLine) or EOF (EndOfFile). Usually enclosed in square brackets.

If it wasn't for this overfed, dumbed-down, TV-addled, NASCAR nation of dittoheads sending them there, Washington wouldn't be run by a bunch of corrupt halfwits whose pockets are lined by the spiders and snakes of the multinationals!!! EOR]